The sixth series of the BBC police drama aired last year and there has been much talk about whether fans will get another instalment from AC-12.
"We are going to have a curry," he said.
"We are all just kind of really keen to get back together, we'd all like to see each other again."
"We really would like to get back to Belfast, we really would like to do something else but we don't know if we are," he said.
Dunbar - who stars as Superintendent Ted Hastings - insisted he had "no idea" whether Mercurio had written anything yet and teased that he "might tell us something" when they meet up.
The last season of the crime drama was shot amid the coronavirus pandemic, which Dunbar said was "tough".
"We were all in bubbles and we couldn't really do anything and the whole town was shut down," he said.
"We stuck to the rules, we worked very hard at sticking to the rules and so therefore we got through it."
The actor, 64, previously teased that Line Of Duty could return in a slightly different format.
Earlier this month he told The Times: “It could be three or four episodes; I don’t think there’s going to be six, for some reason.
“It might be two 90 minutes.
"But it’s all entirely down to Jed what the storyline is going to be. It’s a big ask for him.”
Watch: Adrian Dunbar says Line Of Duty could return as a movie